N = int(input())

L1 = []
try:
    for _ in range(3):
        L1 += [int(input())]
    
    L2 = [L1[0]+L1[1], L1[1]+L1[2], L1[0]+L1[2]]
    print(sorted(set(L2))[::-1][1])
except:
    print('"assert"')